Projector and Blasting Machine

ABSTRACT

Disclosed are a projector comprising an impeller rotated at high speed by a high-speed rotation driving device and a cover for covering the outer peripheral part of the impeller and having a projection material suction port and a projection material discharge port; and a blasting machine. In the projector, the entire of the impeller or the portion of the impeller with which the projection material is collided is formed of a high wear resistant rubber. It is possible to prevent the impeller and the projection material from damage, and to improve the durability of the projector. Furthermore, projection materials having high grinding property or those having fine particles and low specific gravity may also be used for the projector. Since the weight of the projector is light, it can be rotated directly by a motor at high speed and can be used under such conditions as ultra low temperature, ordinary temperature, high moisture, etc.

BACKGROUND OF THE INVENTION

The present invention relates to a projector to be used for a shot blast machine, and a shot blast machine which deburrs and treats surface of molded goods and removes crud attached to surface of workpieces.

The conventional shot blast machine uses the projector with the impeller which is made of metal material. This brings a drawback that the projectile damages itself when it strikes the impeller. Another drawback is that projectile with high grindability cannot be used, since it damages the impeller. A still further drawback is that the impeller being used is made of metal material and heavy, requiring a large motor to drive it, high cost and the impeller being hard to rotate at high speed.

Patent Document 1: Japanese published unexamined application H3-234470

SUMMARY OF THE INVENTION

In view of the conventional drawbacks as described above, it is an object of the present invention to provide a projector and a shot blast machine which do not cause any damage to and can increase the durability of the impeller and the projectile.

It is another object of the present invention to provide a projector and a shot blast machine which can use the projectile with high grindability or of small particle size or low specific gravity.

It is still another object of the present invention to provide a projector and a shot blast machine which can be used at any condition including extreme cold, normal temperature, wet condition and the like.

The above and further objects and novel features of the present invention will more fully appear from the following detailed description when the same is read in connection with the accompanying drawings.

It is to be understood that these are for purpose of illustration only and are not intended to be a definition of the limits of the invention.

In order to achieve the above mentioned purpose, in the present invention, the projector is comprised of an impeller which is high-speed rotated by a high-speed rotating driving device and a cover which covers a periphery of the impeller, wherein the cover has a projectile suction port and a projectile exhaust port therein, and further wherein an entire impeller or a portion of the impeller where projectile strikes is formed of high abrasion-resistant rubber.

According to another aspect of the invention, a shot blast machine which is equipped with the projector is comprised of an impeller which is high-speed rotated by the high-speed rotating driving device and the cover which covers the periphery of the impeller and has the projectile suction port and the projectile exhaust port therein, wherein the entire impeller or a portion of the impeller where the projectile strikes is formed of high abrasion-resistant rubber.

As is clear from the above-mentioned explanations, the present invention as hereinabove defined provides the effects enumerated below.

For the shot blast machine with the impeller, since the shot blast machine uses the impeller which is formed of the high abrasion-resistant rubber, it can prevent the damage of the projectile when it is blasted and strikes the impeller. Therefore, it can improve the durability of the projectile, and it is possible to manufacture it at a relatively low cost.

(2) As described in above (1), it can reduce the noise which is produced when the projectile strikes the impeller.

(3) As described in above (1), when the projectile with high grindability is used, it can be used without the damage of the impeller.

Therefore, widely different kinds of the projectile are used and for widely different kinds of workpiece.

(4) As described in above (1), since the weight of the impeller can be reduced, it is possible to rotate the impeller at high speed. Therefore, the projectile can be blasted out efficiently, and the projectile of small size and high specific gravity can be used.

(5) According to another aspect of the invention having the same effect as the above (1) to (4), the impeller can be directly rotation-driven by a small high speed motor. Thus, size reduction and low cost manufacturing can be achieved.

(6) According to another aspect of the invention having the same effect as the above (1) to (5), durability of the projectile can be further improved and the projector can be further noise-reduced.

(7) According to yet another aspect of the invention having the same effect as the above (1) to (5), deformation of the impeller body under temperature change can be suppressed by the supporting plate, the disc flange, and the plurality of spacing members.

(8) According to yet another aspect of the invention having the same effect as the above (1) to (4), the projector with the impeller blasts out the liquid with the projectile widely, and it deburrs molded goods, treats the surface of molded goods and removes crud attached to the surface of workpieces.

(9) As described in above (8), since the projectile-mixed liquid can be supplied into the projector with the impeller by the pump, the structure is simple, and transporting of the projectile-mixed liquid is smooth.

(10) As described in above (8), since the projectile-mixed liquid can be supplied into the projector with the impeller by the pump and can be blasted out to the workpiece by the projector so as to remove flash from the molded goods (workpiece), it is not necessary to accelerate the speed and increase pressure for the carrying of the projectile-mixed liquid to the projector, the structure is simple and the projectile-mixed liquid is transported reliably.

(11) According to another aspect of the invention having the same effect as the above (1) to (5), the projector has a simple structure and is easy to manufacture. In addition, since the slurry pump is used, it can supply the liquid with the durable projectile in efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view showing a first embodiment of the present invention;

FIG. 2 is a side view showing the first embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along a line of 3-3 in FIG. 1;

FIG. 4 FIG. 4 is a vertical cross-sectional view of a projector showing the first embodiment of the present invention;

FIG. 5 is a cross-sectional view taken along a line of 5-5 in FIG. 4;

FIG. 6 is an explanation view of a nozzle showing the first embodiment of the present invention;

FIG. 7 an explanation view of an operation showing the first embodiment of the present invention;

FIG. 8 is a schematic view showing a second embodiment of the present invention;

FIG. 9 is an explanation view of an operation showing the second embodiment of the present invention;

FIG. 10 is front view showing a third embodiment of the present invention;

FIG. 11 is a cross-sectional view taken along a line of 11-11 in FIG. 11;

FIG. 12 is an explanation view of an operation showing the third embodiment of the present invention;

FIG. 13 is a schematic explanation view showing a fourth embodiment of the present invention;

FIG. 14 is an explanation view of an operation showing the fourth embodiment of the present invention;

FIG. 15 is a front view showing a fifth embodiment of the present invention;

FIG. 16 is a cross-sectional view taken along a line of 16-16 in FIG. 15;

FIG. 17 is a cross-sectional view showing a sixth embodiment of the present invention;

FIG. 18 is a partial fracture cross-sectional view showing a projector;

FIG. 19 is a cross-sectional view taken along a line of 19-19 in FIG. 18;

FIG. 20 is a plan view showing a projector of the sixth embodiment of the present invention;

FIG. 21 is a front view showing an impeller of the sixth embodiment of the present invention;

FIG. 22 is a side view showing an impeller of the sixth embodiment of the present invention;

FIG. 23 is a cross-sectional view taken along a line of 23-23 in FIG. 22;

FIG. 24 is a front view showing a seventh embodiment of the present invention;

FIG. 25 is cross-sectional view taken along a line of 25-25 in FIG. 24; and

FIG. 26 a plan view showing the seventh embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Preferred embodiments of the present invention will now be described in detail below referring to the accompanying drawings.

FIGS. 1 to 7 illustrate a first embodiment of the present invention wherein reference numeral 1 is a shot blast machine which deburrs molded goods, treats the surface of molded goods and removes crud attached to the surface of the workpieces. The shot blast machine 1 is comprised of a housing 2; a table 4 in the form of a perforated plate or a mesh, as a support for a workpiece 3, installed into an upper portion of the housing 2; an openable door 5 attached to the housing 2 enabling placing the workpiece 3 onto and removing the workpiece 3 from the table 4; a separator 7 with a vibrating screen below the table 4 in the housing 2 and communicating with the table 4 through the hopper 6; a liquid tank 8 provided with liquid such as water, cleaning liquid or the like separated out by the separator 7 therein, a projectile tank 9 provided the projectile therein, a small particle tank 10 having small particles therein, and a large particle tank 11 provided large particles therein; a mixing tank 13 having a mixer 12 which mixes the liquid from the liquid tank 8 and projectile from the projectile tank 9; a projector 15 having an impeller 14 made of a high abrasion-resistant rubber, installing in the upper portion of the housing 2 capable of blasting out the projectile-mixed liquid to the table 4; a supplying channel 18 interposed a slurry pump 17 therebetween, the pump 17 sucks the projectile-mixed liquid in the mixing tank 13 and introduces in a nozzle 16 positioned into the projector 15, a pump 19 which showers the liquid of the liquid tank 8 to the workpiece 3 supported by the table 4; and a shower device 21 having a shower nozzle 20.

The projector 15 further includes a wheel cover 23 having an opening 22 provided at the lower portion thereof and forming a nozzle-insertion hole 24 at a wall surface 23 a of a side of suction and inserting fixedly the nozzle 16; the impeller 14 attached into the wheel cover 23 rotatably, being made of high abrasion-resistant rubber; and a high-speed motor 25 attached to the wheel cover 23, capable of making the impeller 14 to drive at a high speed.

In addition, the impeller 14 further includes one side plate 27 attached to a drive shaft 26 of the high-speed motor 25, forming in the shape of a disc; a plurality of blades 28 fixed to a part except for a center portion of the side plate 27 in a radial pattern; and other side plate 30 fixed so as to cover the blades 28, having a nozzle-insertion hole 29 formed at a part corresponding to the nozzle-insertion hole 24 of the wheel cover 23.

The above-constructed shot blast machine 1 uses water as a liquid when it removes the weld flashes of the molded goods. In addition, it uses washing water when it removes the cruds attached at the surface of the workpiece.

When it is performed to blast, the projector 15, pump 19, slurry pump 17 and separator 7 are driven after the workpiece 3 is put on the table 4. Thereby the projectile-mixed liquid of the mixing tank 13 is blasted from the nozzle 16 after it passes through the supplying channel 18 by the slurry pump 17. The blasted liquid including the projectile is blasted to the workpiece 3 on the table 4 by the impeller 14, which rotates at a high speed, of the projector 15.

In this way, since the projectile of the blasted liquid strikes the rotating impeller 14 with the high abrasion-resistant rubber, it can prevent the damage which would occur in the case of the conventional metallic impeller, and the blasting from the impeller 14 can be carried out as in the case of the conventional metallic impeller.

The projectile-mixed liquid blasted out by the projector 15 is supplied to the separator 7 with the removed objects from the workpiece through the hopper 6, and is sorted out as the large particle, projectile, small particle and liquid, and are introduced into the large particle tank 11, projectile tank 9, small particle tank 10 and liquid tank 8 respectively. The liquid supplied into the liquid tank 8 is supplied into the shower nozzle 20 by the mixing tank 13 and pump 19 of the shower device 21, and it is showered to the workpiece 3 on the table 4.

In this way, the projectile-mixed liquid and liquid which is showered are circulated and used for blasting.

Explained next are other embodiments of the present invention as illustrated in FIGS. 8 to 28. In explaining these other embodiments of the present invention, the same component parts as those in the first preferred embodiment of the present invention are given the same numerals in order to avoid overlapping explanations.

A second embodiment of the present invention is shown in FIGS. 8 and 9 and is distinguished from the first embodiment by the fact that a high abrasion-resistant rubber sheet 39 is fixed to an inner wall surface of the wheel cover 23 by adhering, coating and the like in order to blast the projectile-mixed liquid to the workpiece 3 on the table from the side and upper portion of the housing 2; and the projector 15 is replaced from two projectors 15A, 15A which adhered or coated a high abrasion-resistant rubber 41 on a surface of an impeller body 40 made of metal.

A shot blast machine 1A in this way according to the third embodiment has similar advantages to that according to the first embodiment.

A third embodiment of the present invention is shown in FIGS. 10 to 12 and is distinguished from the first embodiment by the fact that a belt conveyor 31 as a supporting device is used, forming in the shape of a L-letter, capable of holding the workpiece 3 and agitating it. A shot blast machine 1B with the belt conveyor 31 according to the third embodiment has similar advantages to that according to the first embodiment.

In addition, reference numerals 32, 33, 34 are revolving shafts which are arranged at the housing 2 so as to form in the shape of a L-letter, reference numeral 35 is belt which is laid on the revolving shaft 32, 33 and 34 so as to be formed in the shape of L-letter, having a plurality of through holes 36; reference numerals 37, 37 are guide rollers which are attached to the housing 2, pressing the both edges of the belt 35 positioned between the revolving shafts 32 and 34; and reference numerals 38 is a reversible motor attached to the housing 2, making the revolving shaft 33 to rotate in the forward and backward directions.

A fourth embodiment of the present invention is shown in FIGS. 13 and 14 and is distinguished from the first embodiment by the fact that the liquid and projectile which are selected by the separator 7 are stored automatically by own weight into the mixing tank 13 with the mixer 12, and the liquid which overflows from the mixing tank 13 is supplied into the shower device 21.

A shot blast machine 1C in this way according to the fourth embodiment has similar advantages to that according to the first embodiment.

A fifth embodiment of the present invention is shown in FIGS. 15 and 16 and is distinguished from the first embodiment by the fact that the projectile which are selected by the separator 7 is stored into a projectile tank 42, and the projectile is sucked from the projectile tank 42 by a suction hose 43 and is supplied into the projector 15.

A shot blast machine 1D in this way according to the fifth embodiment may be composed.

A sixth embodiment of the present invention is shown in FIGS. 17 to 23 and is distinguished from the first preferred embodiment of the present invention by the fact that the impeller 14A is comprised of: an impeller body 40 comprising a discoid side panel 27 of which central portion a projectile suction port 44 is formed, a plurality of blades 28 which are and integrally formed in a radial pattern between the projectile suction port 44 on inner surface and the periphery of the side plate 27, and other side plate 30 integrally formed with the plurality of blades 28, a disk flange fitting hole 45 being formed in central portion thereof; a metallic supporting plate 46 attached in such manner that it contacts with lateral surface of the one side plate 27 of the impeller body 40; a disc flange 47 which is attached to the drive shaft 26 of the high-speed motor 25 in such manner that it contacts with lateral surface of the other side plate 30 of the impeller body 40; and a plurality of metallic spacing members 49 which are attached at predetermined distance through a plurality of shaft holes 48, 48 formed in the one side plate 27 and the other side plate 30 in such manner that distance between the periphery of the disc flange 47 and the supporting plate 46 is kept constant.

A shot blast machine 1E constructed by using a projector 15B and a wheel cover 23A in this way according to the sixth embodiment has similar advantages to that according to the first preferred embodiment of the present invention. In embodiments of the present invention, high abrasion-resistant rubber 51, 51, 52 are disposed on inner wall surfaces, which are also outer periphery of the both sides of a cover body 50, the high abrasion-resistant rubber 51, 51 are fixed to the cover body 50 by a plurality of countersunk screws 53 and nuts 54. However, the present invention is not limited to this application. It may also be applicable to use a high abrasion-resistant rubber which is integrally formed in such manner that it fits inside the inner wall surface of the cover body 50.

A seventh embodiment of the present invention is shown in FIGS. 24 to 26 and is distinguished from the sixth embodiment of the present invention by the fact that it comprises: a hopper-shaped bulkhead 57 which divides the housing 2 in such manner that the upper portion serves as a blast-processing chamber 55 while the lower portion does as a projectile-processing chamber 56; a deburring parts holder 61 which is comprised of a motor 58 which is mounted on the housing 2 inside the blast-processing chamber 56 so as to allow the motor 58 to support and rotate the deburring parts, and a bucket 60 which is formed of a perforated plate having a plurality of through holes 59 being formed therein which allow the projectile to pass through them; a projectile container 62 which reserves the projectile being separated by the separator 7 in stalled in the projectile-processing chamber 56; a suction hose 63 installed in such manner that the projectile reserved in the projectile container 62 can be sucked to the impeller 14A by high-speed rotation of the impeller 14A in the projector 15B; a refrigerant supplier 66 having a refrigerant pipe 65 which is equipped with a solenoid valve therein, the refrigerant supplier 66 supplies refrigerant such as liquefied inert gas including liquefied nitrogen and liquefied carbon dioxide to the blast-processing chamber 55; and

an exhaust pipe 68 which is installed on top of the blast-processing chamber 55 and has a damper therein.

A shot blast machine 1F in this way according to the seventh embodiment has similar advantages to that according to the first preferred embodiment of the present invention.

The present invention allows using projectiles other than those mentioned in the embodiments of the present invention for any type of shot blast machine as long as it blasts out such a projectile by an impeller.

The present invention is applicable in the industry of manufacturing the shot blast machine. 

1. A projector comprising an impeller, a high-speed rotating driving motor for high-speed rotating the impeller and a cover which covers a periphery of the impeller, wherein the cover has a projectile suction port and a projectile exhaust port therein, and further wherein an entire impeller or a portion of the impeller where a projectile strikes is formed of high abrasion-resistant rubber.
 2. The projector of claim 1, further comprising a disc flange and wherein the motor includes a drive shaft, the impeller being attached to the drive shaft through the disc flange.
 3. The projector of claim 1, wherein the high abrasion-resistant rubber is affixed to the portion of the cover where the projectile strikes.
 4. The projector of claim 1, wherein the impeller is comprised of: an impeller body comprising a discoid side panel in a central portion of which a projectile suction port is formed, a plurality of blades which are integrally formed in a radial pattern between the projectile suction port on inner surface and the periphery of the side plate, and other side plate integrally formed with the plurality of blades, a disk flange fitting hole being formed in central portion thereof; a supporting plate mounted in such manner that it contacts with lateral surface of the side plate of the impeller body; a disc flange which is attached to the drive shaft of the high-speed motor in such manner that it contacts with lateral surface of the other side plate of the impeller body; and a plurality of spacing members which are attached at predetermined distance through shaft holes formed in the side plate and the other side plate in such manner that distance between the periphery of the disc flange and the supporting plate is kept constant.
 5. A shot blast machine comprising the projector of claim
 1. 6. The shot blast machine of claim 5, further comprising a disc flange and wherein the motor includes a drive shaft, the impeller being attached to the drive shaft through the disc flange.
 7. A shot blast machine comprising: the projector of claim 1, a support for supporting a workpiece, a housing enclosing the projector and the support; and a slurry pump which supplies projectile-mixed liquid to the projector.
 8. The shot blast machine of claim 7, wherein the projector further comprises a wheel cover for projectiving projectile-mixed liquid to a workpiece supported by the support, underside of the wheel cover being open and a nozzle-insertion hole is formed on a wall of suction-side and the impeller blades have high abrasion-resistant rubber fixed thereon. 